Handle Bcc being a fully qualified address in rotate script

GLPI #30996

root/etc/cron.monthly/maillog-rotate

@@ -11,8 +11,16 @@ if [ "$BCC" != "enabled" -o "$ARCHIVE" != "enabled" ]; then
 fi
 
 USER=$(db configuration getprop qpsmtpd BccUser || echo 'maillog')
+# Truncate if it's a mail address
+USER=${USER%@*}
 HOME="/home/e-smith/files/users/$USER"
 
+# Stop here if the home dir doesn't exist
+if [ \! -d $HOME ]; then
+  echo "$HOME doesn't exist"
+  exit 1
+fi
+
 MONTH=$(date +%m)
 YEAR=$(date +%Y)